the candidates this time, joe biden and paul ryan, will sit during the 90-minute showdown. >>> today metro revealed the biggest change to its rail cars since the system opened more than 30 years ago. there's a number of new features on the brand-new cars. as news4 transportation reporter adam tuss found out, the public is already looking forward to a brand-new ride. >> reporter: all wrapped up for riders, the next generation of metro rail car known as the 7000 series rail car, shiny, sleek, electronic, more room, and the transit agency hopes a better fit for riders. >> no mar carpet. no more carpet. customers have said that they don't want any more carpet in the cars. >> reporter: you're not only supposed to get a better look and feel, but these new rail cars are expected to improve reliability and safety. instead of aluminum, the body's made of steel. able to better withstand an impact if an accident does happen. >> importantly for our customers, it's the 21st century car for washington metro. >> the video you're looking at right now, it can be monitored by the train operator in the